The invention discloses an animal nutrition additive trace element compound package and its preparation and application. The compound package is mainly composed of compound glycine polymineral, selenite and trace element basic salt. The compound glycine polymineral contains glycine copper, glycine Ferrous iron, zinc glycinate, manganese glycinate, etc.; trace element basic salts include at least one of the corresponding basic chloride, basic carbonate or basic sulfate of trace elements such as copper, zinc and manganese. The preparation method of the present invention comprises the following steps: mixing the raw material glycine and inorganic trace element compounds into water, adjusting the pH value, raising the temperature, fully stirring the reaction and discharging the material, and then adding other raw materials to the reaction product to prepare a uniformly dispersed mixed Suspension, and finally dried and granulated to obtain a complex package of trace elements. The trace element compound of the invention can be used as an animal feed additive, and has the advantages of simplified process, high biological potency, low addition amount, obvious growth-promoting effect, less animal side effects and the like.